Significant Enhancement of Triboelectric Charge Density by Fluorinated Surface Modification in Nanoscale for Converting Mechanical Energy

Li, Hua Yang; Su, Li; Kuang, Shuang Yang; Pan, Caofeng; Zhu, Guang; Wang, Zhong Lin

doi:10.1002/adfm.201502318

Cited by 222 publications

(137 citation statements)

References 21 publications

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“…From the PFM amplitude images, it can be observed that the amplitude displayed by S4 has much higher contrast than those of sample S1 & S2, while sample S1 and S2 exhibit a much broader distribution of domains. Now, the PFM signal is given by (8) where d 33 is the piezoelectric strain coefficient, V ac is the driving voltage, and Q is the quality factor [34]. The obtained piezoelectric coefficient of -41 pmV -1 for sample S1 comprising of pristine ZnO nanosheets layer is comparable to the values reported in the literature for the same type of materials [27] and is higher than that for bulk ZnO [27].…”

Section: Mechanism For Performance Enhancement Of Tengssupporting

confidence: 72%

“…Previous literature suggests that the charge density of the TENG can be enhanced by effectively controlling the microstructure and porosity of the polymer films [4,9,18,26]. In fact, in a recent work carried out by Wang et al, nanostructured porous PVDF and PA6 membrane based TENG produced a significantly higher charge density (71 Cm -2 ) than their smooth counterpart (48 Cm -2 ) [8]. The observed high porosity of phase-inversion membranes is highly beneficial in enhancing the performance of the TENGs owing to the increased effective surface area [1,16] and will be discussed further in the following sections.…”

Section: Microstructure Of Zno Nanosheets and Zno-fluoropolymer Compomentioning

confidence: 98%

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Significant triboelectric enhancement using interfacial piezoelectric ZnO nanosheet layer

et al. 2017

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Significant triboelectric enhancement using interfacial piezoelectric ZnO nanosheet layer, Nano Energy, http://dx.doi.org/10. 1016/j.nanoen.2017.08.053 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting galley proof before it is published in its final citable form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. Utilising an interfacial piezoelectric ZnO nanosheet layer, a significant enhancement in the power density is reported for the triboelectric nanogenerators (TENG) based on phase inversion membranes of polyvinylidene fluoride (PVDF) and polyamide-6 (PA6). At an applied force of 80 N, the TENG device incorporating electrochemically deposited ZnO nanosheets produces an output voltage of ~625 V and a current density of ~40 mAm -2 (corresponding a charge density of 100.6 Cm -2 ), respectively; significantly higher than ~310 V and ~10 mAm -2 (corresponding a charge density of 77.45 Cm -2 ) for the pristine TENG device. The enhancement in the surface charge density provided by the interfacial piezoelectric ZnO layer is also reflected in the high piezoelectric coefficient d 33 (-74 pmV -1 ) as compared to the pristine fluoropolymer membranes (-50 pmV -1 ). For tribo-negative membranes incorporating the interfacial ZnO layer, piezoelectric force microscopy measurements further show enhanced domain size which can be attributed to the interfacial dipole-dipole interaction with the ferroelectric polarization of PVDF, which promotes the alignment with the polar axis of ZnO. Under compressive stress, the piezoelectric potential thus produced in the ZnO nanosheets provides charge injection on to the surface of ZnSnO 3 -PVDF membrane, improving the charge density, which in-turn significantly enhances the power density from 0.11 to ~1.8 W/m 2 . The TENG devices thus fabricated using a facile electrochemical deposition and phase inversion technique show enhanced output power without the need for high electric field poling or external charge injection process by relying on coupling of triboelectric and piezoelectric effects.

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Section: Mechanism For Performance Enhancement Of Tengssupporting

confidence: 72%

Section: Microstructure Of Zno Nanosheets and Zno-fluoropolymer Compomentioning

confidence: 98%

Significant triboelectric enhancement using interfacial piezoelectric ZnO nanosheet layer

et al. 2017

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“…Subsequent electrical outputs (e.g., open circuit voltage and short circuit current) linearly depend on the surface charge density . Great progress has been made to achieve TEGs with high electrical output by optimizing micro‐ and nanoscale morphology, surface chemistry, and device architecture …”

Section: Introductionmentioning

confidence: 99%

All‐Textile Triboelectric Generator Compatible with Traditional Textile Process

Zhang

Eyer

et al. 2016

Adv Materials Technologies

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All‐textile triboelectric generators (TEGs) allow for seamless integration of TEGs into garments, while maintaining the intrinsic flexibility, breathability, durability, and aesthetic value of normal textiles. However, practical approaches to construct fabric TEGs using traditional textile processes, such as sewing, weaving, and knitting, are underreported. In this work, two approaches to create an all‐textile TEG using straight‐forward textile manufacturing methods are presented. The first approach is to assemble two different cloths of opposite surface charge characteristics in a face‐to‐face configuration. A cotton fabric functionalized with fluoroalkylated polymeric siloxanes is necessary to generate usable triboelectric power output, when coupled with a pristine nylon cloth. The increased surface charge density by introducing fluoroalkyl groups is confirmed by Kelvin probe force microscopy measurements. The second approach is to weave or knit together two different conductive threads of opposite surface charge characteristics to create a monolithic triboelectric textile. The weave or knit pattern used to assemble this textile directly controls the density of contact points between the two types of threads, which, ultimately, determines the areal triboelectric power output of the textile. Overall, two feasible methods for constructing unprecedented textile‐based triboelectric generators with notable power output are presented.

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“…Figure b shows how the TEG built into the SPED is capable of producing peaks of ≈300 V every time it is tapped by the user. The triboelectric voltages generated by these paper‐based tribogenerators with two single‐layer electrodes are comparable to those of multilayer tribogenerators with nanotextured surfaces . The voltages generated by the TEG can be easily stored, after rectification through a diode bridge, in a capacitor to enable the recharging of other electronic devices in resource‐limited settings (Figure d).…”

Section: Resultsmentioning

confidence: 82%

Self‐Powered, Paper‐Based Electrochemical Devices for Sensitive Point‐of‐Care Testing

Pal

Cuellar

Kuang

et al. 2017

Adv Materials Technologies

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to enhance the mass transport on the surface of the electrodes and to increase their current response, [5] not requiring external pumps for transporting fluids and offering higher sensitivity and selectivity than other paper-based analytical devices that rely on colorimetric detection. [6] Although the characteristics of PEDs make them especially suited for point-ofcare testing (POCT), these devices-with the exception of blood glucose metersrequire skilled personnel, electric power, and expensive equipment to provide accurate quantitative results. The fabrication of PEDs, which can be used in remote settings, independently of infrastructure constraints, and with the capability to facilitate telemedicine applications to send accurate POCT results to welltrained people who can help providing an optimal treatment would be desirable to promote preventive diagnostics in the field, especially in resource poor areas. Here, we propose to benefit from the latest developments in paper-based electronics and microfluidics to fabricate low-cost, sensitive, and disposable electrochemical analytical devices that can be directly powered by the user, thanks to the integration of a paper-based triboelectric generator (TEG), and be used as a portable alternative for point-of-care diagnostics.Electrochemistry has consistently provided simple and portable techniques to analyze small molecules in complex biological environments with a high degree of specificity and selectivity at a moderate cost. [7] The trend to decrease the cost of electrochemical assays has led to the exploration of low-cost substrates, such as cellulose-based paper and thread, [8][9][10] and novel-printed electrodes and conductive patterns to contribute to low-cost diagnostics. [11,12] Dungchai et al. provided the first quantification of glucose, lactate, and uric acid in serum using chronoamperometry measurements performed by conductive electrodes printed on a paper-based microfluidic channel. [13] Many other PEDs have been developed for the quantification of antibodies, [14] proteins, [1] DNA, [3] ascorbic acid, [15] and metal ions (such as Pb 2+ , Cd 2+ , Zn 2+ …), [4,16] proving that PEDs can provide an inexpensive, versatile, and easy to dispose platform for POCT. In spite of their numerous advantages, PEDs remain relatively underexploited in in-field applications due to the tendency of paper to absorb water from the environment, compromising the performance of the printed electrodes. [7] Other challenges relate to the need of This work describes the fabrication of self-powered, paper-based electrochemical devices (SPEDs) designed for sensitive diagnostics in low-resource settings and at the point of care. SPEDs are inexpensive, lightweight, mechanically flexible, easy to use, and disposable by burning. The top layer of the SPED is fabricated using cellulose paper with patterned hydrophobic domains that delineate hydrophilic, wicking-based microfluidic channels for accurate colorimetric assays, and self-pipetting test zones for electrochemical detection. The ...

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Significant Enhancement of Triboelectric Charge Density by Fluorinated Surface Modification in Nanoscale for Converting Mechanical Energy

Cited by 222 publications

References 21 publications

Significant triboelectric enhancement using interfacial piezoelectric ZnO nanosheet layer

Significant triboelectric enhancement using interfacial piezoelectric ZnO nanosheet layer

All‐Textile Triboelectric Generator Compatible with Traditional Textile Process

Self‐Powered, Paper‐Based Electrochemical Devices for Sensitive Point‐of‐Care Testing

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